Initial version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.gitignore

@@ -0,0 +1 @@
+git-credential-vault

go.mod

@@ -0,0 +1,11 @@
+module github.com/Luzifer/git-credential-vault
+
+go 1.14
+
+require (
+	github.com/Luzifer/go_helpers/v2 v2.10.0
+	github.com/Luzifer/rconfig/v2 v2.2.1
+	github.com/hashicorp/vault/api v1.0.4
+	github.com/pkg/errors v0.9.1
+	github.com/sirupsen/logrus v1.5.0
+)

go.sum

@@ -0,0 +1,150 @@
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main.go

@@ -0,0 +1,117 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/Luzifer/go_helpers/v2/env"
+	"github.com/Luzifer/rconfig/v2"
+)
+
+const (
+	actionGet   = "get"
+	actionStore = "store"
+	actionErase = "erase"
+)
+
+var (
+	cfg = struct {
+		LogLevel        string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
+		VaultAddr       string `flag:"vault-addr" default:"" description:"Vault Address to connect to" validate:"nonzero"`
+		VaultPathPrefix string `flag:"vault-path-prefix" default:"" description:"Prefix to prepend to hostname" validate:"nonzero"`
+		VaultToken      string `flag:"vault-token" default:"" description:"Token to use in Vault connection" validate:"nonzero"`
+		VersionAndExit  bool   `flag:"version" default:"false" description:"Prints current version and exits"`
+	}{}
+
+	version = "dev"
+)
+
+// Instead of init() function not to fail tests by arg parser
+func initApp() {
+	rconfig.AutoEnv(true)
+	if err := rconfig.ParseAndValidate(&cfg); err != nil {
+		log.Fatalf("Unable to parse commandline options: %s", err)
+	}
+
+	if cfg.VersionAndExit {
+		fmt.Printf("git-credential-vault %s\n", version)
+		os.Exit(0)
+	}
+
+	if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
+		log.WithError(err).Fatal("Unable to parse log level")
+	} else {
+		log.SetLevel(l)
+	}
+}
+
+func main() {
+	initApp()
+
+	var action string
+	if len(rconfig.Args()) == 2 {
+		action = rconfig.Args()[1]
+	}
+
+	switch action {
+
+	case actionGet:
+		handleGetAction()
+
+	case actionErase, actionStore:
+		// Defined action but unsupported by this provider
+		return
+
+	default:
+		log.Fatalf("Unsupported action %q", action)
+
+	}
+}
+
+func handleGetAction() {
+	values, err := readInput(os.Stdin)
+	if err != nil {
+		log.WithError(err).Fatal("Unable to parse input values")
+	}
+
+	if proto := values["protocol"]; proto != "https" {
+		log.Debugf("Unsupported protocol %q", proto)
+		return
+	}
+
+	vaultValues, err := getCredentialSetFromVault(values["host"])
+	if err != nil {
+		log.WithError(err).Fatal("Unable to retrieve values from Vault")
+	}
+
+	for k, v := range vaultValues {
+		values[k] = v
+	}
+
+	fmt.Fprintln(os.Stdout, strings.Join(env.MapToList(values), "\n"))
+}
+
+func readInput(input io.Reader) (map[string]string, error) {
+	var (
+		lines   []string
+		scanner = bufio.NewScanner(input)
+	)
+
+	for scanner.Scan() {
+		var text = strings.TrimSpace(scanner.Text())
+
+		if text == "" {
+			break
+		}
+
+		lines = append(lines, text)
+	}
+
+	return env.ListToMap(lines), errors.Wrap(scanner.Err(), "Unable to read input")
+}

main_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestReadInput(t *testing.T) {
+	input := strings.NewReader(strings.Join([]string{
+		"protocol=https",
+		"host=github.com",
+		"", // Defined as end-of-input
+		"shouldnt=bethere",
+	}, "\n"))
+
+	vars, err := readInput(input)
+	if err != nil {
+		t.Fatalf("Read input errored: %s", err)
+	}
+
+	if l := len(vars); l != 2 {
+		t.Errorf("Unexpected number of values: %d != 2", l)
+	}
+
+	if h := vars["host"]; h != "github.com" {
+		t.Errorf("Unexpected value %s: %s != %s", "host", h, "github.com")
+	}
+
+	if p := vars["protocol"]; p != "https" {
+		t.Errorf("Unexpected value %s: %s != %s", "protocol", p, "https")
+	}
+}

vault.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"path"
+
+	"github.com/hashicorp/vault/api"
+	"github.com/pkg/errors"
+)
+
+func getCredentialSetFromVault(host string) (map[string]string, error) {
+	client, err := api.NewClient(nil)
+	if err != nil {
+		return nil, errors.Wrap(err, "Unable to create Vault client")
+	}
+
+	secret, err := client.Logical().Read(path.Join(cfg.VaultPathPrefix, host))
+	if err != nil {
+		return nil, errors.Wrap(err, "Unable to fetch secret from Vault")
+	}
+
+	if secret == nil || secret.Data == nil {
+		return nil, errors.New("Found no data")
+	}
+
+	var out = map[string]string{}
+	for k, v := range secret.Data {
+		vs, ok := v.(string)
+		if !ok {
+			return nil, errors.Errorf("Key %q contained invalid data type %T", k, v)
+		}
+
+		out[k] = vs
+	}
+
+	return out, nil
+}